Abstract
Magnetotransport measurements are presented on polycrystalline MgB 2 samples. The `resistive' upper critical magnetic field reveals a temperature dependence with a positive curvature from T c=39.3 K down to about 20 K, then changes to a slightly negative curvature reaching 25 T at 1.5 K. The 25-T upper critical field is much higher than what is known so far on polycrystals of MgB 2 but it is in agreement with recent data obtained on epitaxial MgB 2 films. The deviation of B c2( T) from standard BCS might be due to the proposed two-gap superconductivity in this compound. The observed quadratic normal-state magnetoresistance with validity of Kohler's rule can be ascribed to classical trajectory effects in the low-field limit.
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